For a submarine, identify when it will have the least buoyant force acting on it

Question

For a submarine, identify when it will have the least buoyant force acting on it. Assume that neither the volume of the submarine nor the density of the water change. Choose all that apply.

When it is empty and fully submerged at a depth of 89 m.
When it is empty, fully submerged, and resting on the bottom at a depth of 178 m. When it is in dry dock and no part of it is submerged in water.
When it is full of cargo and floating on the surface.
When it is empty and floating on the surface.
When it is full of cargo, fully submerged, and resting on the bottom at a depth of 178 m.
When it is full of cargo and fully submerged at a depth of 89 m.

Explanation / Answer

If it isn't when dry docked, we need to keep it when it is lightest and in the least dense water. When empty and floating on the surface.

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